1444444157 has 4 divisors (see below), whose sum is σ = 1555555260. Its totient is φ = 1333333056.

The previous prime is 1444444081. The next prime is 1444444159. The reversal of 1444444157 is 7514444441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 396368281 + 1048075876 = 19909^2 + 32374^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444444157 - 2¹² = 1444440061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1444444157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444444159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55555532 + ... + 55555557.

It is an arithmetic number, because the mean of its divisors is an integer number (388888815).

Almost surely, 2^1444444157 is an apocalyptic number.

It is an amenable number.

1444444157 is a deficient number, since it is larger than the sum of its proper divisors (111111103).

1444444157 is a wasteful number, since it uses less digits than its factorization.

1444444157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111111102.

The product of its digits is 143360, while the sum is 38.

The square root of 1444444157 is about 38005.8437217226. The cubic root of 1444444157 is about 1130.4037393546.

Adding to 1444444157 its reverse (7514444441), we get a palindrome (8958888598).

The spelling of 1444444157 in words is "one billion, four hundred forty-four million, four hundred forty-four thousand, one hundred fifty-seven".